|Publication number||US8130440 B2|
|Application number||US 12/254,766|
|Publication date||Mar 6, 2012|
|Filing date||Oct 20, 2008|
|Priority date||Oct 19, 2007|
|Also published as||CN101828145A, CN101828145B, CN101828146A, CN101828146B, EP2210280A2, EP2212926A2, US8169686, US8797628, US20090103161, US20090103165, US20100284055, US20120194896, WO2009052324A2, WO2009052324A3, WO2009052326A2, WO2009052326A3|
|Publication number||12254766, 254766, US 8130440 B2, US 8130440B2, US-B2-8130440, US8130440 B2, US8130440B2|
|Inventors||Manish Kothari, Kasra Khazeni|
|Original Assignee||Qualcomm Mems Technologies, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (126), Non-Patent Citations (15), Referenced by (9), Classifications (13), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application Ser. No. 60/999,566 filed on Oct. 19, 2007, titled “COLORED PHOTOVOLTAICS USING INTERFEROMETRIC DISPLAY DEVICES AND PHOTOVOLTAIC INTEGRATED INTERFEROMETRIC DISPLAYS”, the disclosure of which is hereby expressly incorporated by reference in its entirety.
This application is related to U.S. patent application Ser. No. 11/966,850, filed on Dec. 28, 2007, titled “PHOTOVOLTAIC DEVICES WITH INTEGRATED COLOR INTERFEROMETRIC FILM STACKS” and Application titled “DISPLAY WITH INTEGRATED PHOTOVOLTAICS” 12/254,766, filed on even date herewith.
1. Field of the Invention
The invention relates generally to display devices for actively displaying images.
2. Description of the Related Technology
Active displays may be made up of pixels that are fully or partly reflective, transmissive, or emissive. Hence a display may generate images with pixels that operate by fully or partially reflecting incident ambient light, pixels that are light-emissive, or transmissive pixels where light is generated from within the display and projected upon the transmissive pixels. Reflective display technologies may include, but are not limited to, liquid crystal, MEMS (such as interferometric modulator), electrophoretic (such as e-ink or e-paper), and other display technologies using reflected ambient light to generate an image. Emissive displays include displays with a backlight to illuminate the active transmissive pixels, such as a liquid crystal or thin film transistor liquid crystal, or displays where the active pixels themselves generate or emit light such as vacuum fluorescent, light emitting diode, organic light emitting diode, or surface-conduction electron-emitter displays.
Displays can include MEMS devices, such as an interferometric modulator. As used herein, the term interferometric modulator or interferometric light modulator refers to a device that selectively absorbs and/or reflects light using the principles of optical interference. In certain embodiments, an interferometric modulator may comprise a pair of conductive plates, one or both of which may be transparent and/or reflective in whole or part and capable of relative motion upon application of an appropriate electrical signal. In a particular embodiment, one plate may comprise a stationary layer deposited on a substrate and the other plate may comprise a metallic membrane separated from the stationary layer by an air gap. As described herein in more detail, the position of one plate in relation to another can change the optical interference of light incident in the interferometric modulator. Such devices have a wide range of applications, and it would be beneficial in the art to utilize and/or modify the characteristics of these types of devices so that their features can be exploited in improving existing products and creating new products that have not yet been developed.
In one embodiment, a display device displays an image toward a front side, with a back side opposite the front side. The display device comprises a display and a photovoltaic cell. The display includes an array of active pixels in an image region. The photovoltaic cell includes a photovoltaic material formed over one of the front side and the back side of the display in the image region. The photovoltaic cell is oriented to be capable of receiving light.
In another embodiment, a method of manufacturing a display device is provided. The display device is configured to display an image toward a front side, with a back side opposite the front side. The method includes providing a display comprising an array of active pixels in an image region. The method also includes disposing a photovoltaic material over one of a front and a back side of the display in the image region.
In yet another embodiment, a method of operating a display is provided. The method includes receiving light in a photovoltaic material at one of a front side and a back side of a display element in an image region. The method also includes converting the light into electricity.
In an alternative embodiment, a display device displays an image toward a front side, with a back side opposite the front side. The display device includes a means for displaying a pixilated image and a means for converting light into electricity. The converting means is positioned over one of a front side and a back side of the displaying means.
Example embodiments disclosed herein are illustrated in the accompanying schematic drawings, which are for illustrative purposes only. The following figures are not necessarily drawn to scale.
Although certain embodiments and examples are discussed herein, it is understood that the inventive subject matter extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses of the invention and obvious modifications and equivalents thereof. It is intended that the scope of the inventions disclosed herein should not be limited by the particular disclosed embodiments. Thus, for example, in any method or process disclosed herein, the acts or operations making up the method/process may be performed in any suitable sequence and are not necessarily limited to any particular disclosed sequence. Various aspects and advantages of the embodiments have been described where appropriate. It is to be understood that not necessarily all such aspects or advantages may be achieved in accordance with any particular embodiment. Thus, for example, it should be recognized that the various embodiments may be carried out in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other aspects or advantages as may be taught or suggested herein. The following detailed description is directed to certain specific embodiments of the invention. However, the invention can be embodied in a multitude of different ways. The embodiments described herein may be implemented in a wide range of display devices.
In this description, reference is made to the drawings wherein like parts are designated with like numerals throughout. The embodiments may be implemented in any device that is configured to display an image, whether in motion (e.g., video) or stationary (e.g., still image), and whether textual or pictorial. More particularly, it is contemplated that the embodiments may be implemented in or associated with a variety of electronic devices such as, but not limited to, mobile telephones, wireless devices, personal data assistants (PDAs), hand-held or portable computers, GPS receivers/navigators, cameras, MP3 players, camcorders, game consoles, wrist watches, clocks, calculators, television monitors, flat panel displays, computer monitors, auto displays (e.g., odometer display, etc.), cockpit controls and/or displays, display of camera views (e.g., display of a rear view camera in a vehicle), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., display of images on a piece of jewelry). PV cells may be integrated with active displays such as emissive, transmissive, and reflective or partially reflective (transflective) displays. The PV cell may collect light in inactive regions of the display, such as gaps, spaces, holes, spacers, pillars, posts, rails, or other support structures formed from a transparent or translucent material such as air, silicon dioxide, or other material. Similarly, the active structures, elements, or pixels in a display may be somewhat transmissive, even if they are primarily designed to be reflective. The PV cell may be formed in front of or behind the display, and in some embodiments blanket PV materials extend across the array. One kind of reflective or transflective display technology is a MEMS-based display technology called an interferometric modulator.
One interferometric modulator display embodiment comprising an interferometric MEMS display element is illustrated in
The depicted portion of the pixel array in
The optical stacks 16 a and 16 b (collectively referred to as optical stack 16), as referenced herein, typically comprise several fused layers, which can include an electrode layer, such as indium tin oxide (ITO), a partially reflective layer, such as chromium, and a transparent dielectric. The optical stack 16 is thus electrically conductive, partially transparent and partially reflective, and may be fabricated, for example, by depositing one or more of the above layers onto a transparent substrate 20. The partially reflective layer can be formed from a variety of materials that are partially reflective such as various metals, semiconductors, and dielectrics. The partially reflective layer can be formed of one or more layers of materials, and each of the layers can be formed of a single material or a combination of materials.
In some embodiments, the layers of the optical stack 16 are patterned into parallel strips, and may form row electrodes in a display device as described further below. The movable reflective layers 14 a, 14 b (also known as “mirrors” or “reflectors”) may be formed as a series of parallel strips of a deposited metal layer or layers (orthogonal to the row electrodes of 16 a, 16 b) to form columns deposited on top of posts 18 and an intervening sacrificial material deposited between the posts 18. When the sacrificial material is etched away, the movable reflective layers 14 a, 14 b are separated from the optical stacks 16 a, 16 b by a defined gap 19. A highly conductive and reflective material such as aluminum may be used for the reflective layers 14, and these strips may form column electrodes in a display device. Note that
With no applied voltage, the gap 19 remains between the movable reflective layer 14 a and optical stack 16 a, with the movable reflective layer 14 a in a mechanically relaxed state, as illustrated by the pixel 12 a in
In one embodiment, the processor 21 is also configured to communicate with an array driver 22. In one embodiment, the array driver 22 includes a row driver circuit 24 and a column driver circuit 26 that provide signals to a display array or panel 30. The cross section of the array illustrated in
As described further below, in typical applications, a frame of an image may be created by sending a set of data signals (each having a certain voltage level) across the set of column electrodes in accordance with the desired set of actuated pixels in the first row. A row pulse is then applied to a first row electrode, actuating the pixels corresponding to the set of data signals. The set of data signals is then changed to correspond to the desired set of actuated pixels in a second row. A pulse is then applied to the second row electrode, actuating the appropriate pixels in the second row in accordance with the data signals. The first row of pixels are unaffected by the second row pulse, and remain in the state they were set to during the first row pulse. This may be repeated for the entire series of rows in a sequential fashion to produce the frame. Generally, the frames are refreshed and/or updated with new image data by continually repeating this process at some desired number of frames per second. A wide variety of protocols for driving row and column electrodes of pixel arrays to produce image frames may be used.
The display device 40 includes a housing 41, a display 30, an antenna 43, a speaker 45, an input device 48, and a microphone 46. The housing 41 is generally formed from any of a variety of manufacturing processes, including injection molding, and vacuum forming. In addition, the housing 41 may be made from any of a variety of materials, including but not limited to plastic, metal, glass, rubber, and ceramic, or a combination thereof. In one embodiment the housing 41 includes removable portions (not shown) that may be interchanged with other removable portions of different color, or containing different logos, pictures, or symbols.
The display 30 of exemplary display device 40 may be any of a variety of displays, including a bi-stable display, as described herein. In other embodiments, the display 30 includes a flat-panel display, such as plasma, EL, OLED, STN LCD, or TFT LCD as described above, or a non-flat-panel display, such as a CRT or other tube device. However, for purposes of describing the present embodiment, the display 30 includes an interferometric modulator display, as described herein.
The components of one embodiment of exemplary display device 40 are schematically illustrated in
The network interface 27 includes the antenna 43 and the transceiver 47 so that the exemplary display device 40 can communicate with one or more devices over a network. In one embodiment the network interface 27 may also have some processing capabilities to relieve requirements of the processor 21. The antenna 43 is any antenna for transmitting and receiving signals. In one embodiment, the antenna transmits and receives RF signals according to the IEEE 802.11 standard, including IEEE 802.11(a), (b), or (g). In another embodiment, the antenna transmits and receives RF signals according to the BLUETOOTH standard. In the case of a cellular telephone, the antenna is designed to receive CDMA, GSM, AMPS, W-CDMA, or other known signals that are used to communicate within a wireless cell phone network. The transceiver 47 pre-processes the signals received from the antenna 43 so that they may be received by and further manipulated by the processor 21. The transceiver 47 also processes signals received from the processor 21 so that they may be transmitted from the exemplary display device 40 via the antenna 43.
In an alternative embodiment, the transceiver 47 can be replaced by a receiver. In yet another alternative embodiment, network interface 27 can be replaced by an image source, which can store or generate image data to be sent to the processor 21. For example, the image source can be a digital video disc (DVD) or a hard-disc drive that contains image data, or a software module that generates image data.
Processor 21 generally controls the overall operation of the exemplary display device 40. The processor 21 receives data, such as compressed image data from the network interface 27 or an image source, and processes the data into raw image data or into a format that is readily processed into raw image data. The processor 21 then sends the processed data to the driver controller 29 or to frame buffer 28 for storage. Raw data typically refers to the information that identifies the image characteristics at each location within an image. For example, such image characteristics can include color, saturation, and gray-scale level.
In one embodiment, the processor 21 includes a microcontroller, CPU, or logic unit to control operation of the exemplary display device 40. Conditioning hardware 52 generally includes amplifiers and filters for transmitting signals to the speaker 45, and for receiving signals from the microphone 46. Conditioning hardware 52 may be discrete components within the exemplary display device 40, or may be incorporated within the processor 21 or other components.
The driver controller 29 takes the raw image data generated by the processor 21 either directly from the processor 21 or from the frame buffer 28 and reformats the raw image data appropriately for high speed transmission to the array driver 22. Specifically, the driver controller 29 reformats the raw image data into a data flow having a raster-like format, such that it has a time order suitable for scanning across the display array 30. Then the driver controller 29 sends the formatted information to the array driver 22. Although a driver controller 29, such as a LCD controller, is often associated with the system processor 21 as a stand-alone Integrated Circuit (IC), such controllers may be implemented in many ways. They may be embedded in the processor 21 as hardware, embedded in the processor 21 as software, or fully integrated in hardware with the array driver 22.
Typically, the array driver 22 receives the formatted information from the driver controller 29 and reformats the video data into a parallel set of waveforms that are applied many times per second to the hundreds and sometimes thousands of leads coming from the display's x-y matrix of pixels.
In one embodiment, the driver controller 29, array driver 22, and display array 30 are appropriate for any of the types of displays described herein. For example, in one embodiment, the driver controller 29 is a conventional display controller or a bi-stable display controller (e.g., an interferometric modulator controller). In another embodiment, the array driver 22 is a conventional driver or a bi-stable display driver (e.g., an interferometric modulator display). In one embodiment, the driver controller 29 is integrated with the array driver 22. Such an embodiment is common in highly integrated systems such as cellular phones, watches, and other small area displays. In yet another embodiment, the display array 30 is a typical display array or a bi-stable display array (e.g., a display including an array of interferometric modulators).
The input device 48 allows a user to control the operation of the exemplary display device 40. In one embodiment, input device 48 includes a keypad, such as a QWERTY keyboard or a telephone keypad, a button, a switch, a touch-sensitive screen, a pressure- or heat-sensitive membrane. In one embodiment, the microphone 46 is an input device for the exemplary display device 40. When the microphone 46 is used to input data to the device, voice commands may be provided by a user for controlling operations of the exemplary display device 40.
The power supply 50 can include a variety of energy storage devices as are well known in the art. For example, in one embodiment, the power supply 50 is a rechargeable battery, such as a nickel-cadmium battery or a lithium ion battery. In another embodiment, the power supply 50 is a renewable energy source, a capacitor, or a solar cell, including a plastic solar cell, and solar-cell paint. In another embodiment, the power supply 50 is configured to receive power from a wall outlet.
In some implementations control programmability resides, as described above, in a driver controller which can be located in several places in the electronic display system. In some cases control programmability resides in the array driver 22. The above-described optimization may be implemented in any number of hardware and/or software components and in various configurations.
The details of the structure of interferometric modulators that operate in accordance with the principles set forth above may vary widely. For example,
In embodiments such as those shown in
Certain embodiments disclosed herein include photovoltaic (PV) cells or devices integrated with displays comprising MEMS, LCD, LED, or other display technology. Such displays may actively display images or information while simultaneously collecting ambient and/or display-generated light for conversion into electricity. Hence an active (programmable) outdoor display may advantageously convert unused sunlight to electricity, or a display on a mobile device may help offset standby power usage by collecting ambient light.
In some embodiments, transmissive PV cells may overlie the display image regions. In other embodiments, PV active materials are included within the active image regions or array areas of display devices to capture, and convert to electricity, unused ambient or display-generated light. Depending upon the active display technology, up to 30% or more of the display array region's surface area may actually be made up of inactive regions or areas that do not contribute to the pixilated image or information displayed. This means that up to 30% or more of ambient light incident upon active image regions of a display is “wasted,” and may therefore be captured by a PV material for useful conversion to electricity. This may be accomplished by placing a blanket PV material behind the display, allowing the ambient light incident upon the display to shine or transmit through inactive regions of the display and onto the blanket PV material underneath. In fact, in some display technologies, the active pixels comprising the active region of a display themselves may be partially transmissive, and hence some light may reach the PV active material even where there are active pixels or elements.
With reference to
The PV material 81 is generally sandwiched between two electrodes that provide an electrical current path. The electrodes 82, 83 can be formed of aluminum, silver, or molybdenum or some other conducting material. The electrodes 82, 83 may also be formed of a transparent conducting material. The electrodes 82, 83 may be designed to cover a significant portion of the front surface of the p-n junction so as to lower contact resistance and increase collection efficiency. In embodiments wherein the electrodes 82, 83 are formed of an opaque material, the electrodes 82, 83 may be configured to leave openings over the front of the PV material to allow illumination to impinge on the PV material. In some embodiments, the back or front electrodes 82, 83 can include a transparent conductor, for example, transparent conducting oxide (TCO) such as tin oxide (SnO2) or indium tin oxide (ITO). The TCO can provide electrical contact and conductivity and simultaneously be transparent to the incoming light. As illustrated, the PV cell also comprises an anti-reflective (AR) coating 84 disposed over the front electrode 83, although the AR coating may also optionally be disposed over the back electrode 82 in embodiments where light may be expected to be incident on or transmissive through the back of the PV cell 80 (as in the front PV cell 110 in
When the PV material 81 is illuminated, photons transfer energy to electrons in the active region. If the energy transferred by the photons is greater than the band-gap of the semiconducting material, the electrons may have sufficient energy to enter the conduction band. An internal electric field is created with the formation of the p-n junction. The internal electric field operates on the energized electrons to cause these electrons to move, thereby producing a current flow in an external circuit 85. The resulting current flow can be used to power various electrical devices. For example, the resulting current flow may be stored for later use by charging a battery 86 or a capacitor as shown in
The PV material(s) can be include any of a variety of light absorbing, photovoltaic materials such as crystalline silicon (c-silicon), amorphous silicon (α-silicon), germanium (Ge), Ge alloys, cadmium telluride (CdTe), copper indium diselenide (CIS), copper indium gallium diselenide (CIGS), light absorbing dyes and polymers, polymers dispersed with light absorbing nanoparticles, or tandem multi-junction photovoltaic materials and films. The PV active material 81 may comprise other appropriate materials, including III-V semiconductor materials include such materials as gallium arsenide (GaAs), indium nitride (InN), gallium nitride (GaN), boron arsenide (BAs). Semiconductor alloys like indium gallium nitride may also be used. Other photovoltaic materials and devices are also possible. Methods of forming these materials are known to those having skill in the art. As an illustrative example, alloys like CIGS can be formed by a vacuum-based process where copper, gallium, and indium are co-evaporated or co-sputtered then annealed with a selenide vapor to form the CIGS structure. Non-vacuum-based alternative processes are also known to those of skill in the art. A deposited thin film PV active material can comprise, for example, an amorphous silicon thin film, which has recently been gaining in popularity. Amorphous silicon as thin films can be deposited over large areas by physical vapor deposition (PVD), chemical vapor deposition (CVD), electro-chemical vapor deposition, or plasma-enhanced chemical vapor deposition (PECVD), among other techniques. As is known by those with skill in the art, PV active materials comprising amorphous silicon layers may include one or more junctions with n-doped and/or p-doped silicon and may further comprise p-i-n junctions. Other materials may also be used. The light absorbing material(s) where photons are absorbed and transfer energy to electrical carriers (holes and electrons) is referred to herein as the PV active layer or material of the PV cell, and this term is meant to encompass multiple active sub-layers. The material for the PV active layer can be chosen depending on the desired performance and the application of the PV cell.
Layers 81, 82, 83 may be deposited using deposition techniques such as physical vapor deposition techniques, chemical vapor deposition techniques, electro-chemical vapor deposition techniques, etc. Thin film PV cells may comprise amorphous or polycrystalline materials such as thin-film silicon, CIS, CdTe or CIGS. Some advantages of thin film PV cells are small device footprint and scalability of the manufacturing process among others.
Given that certain advantages may be obtained by integrating PV cells with displays, the embodiments below describe incorporating or integrating photovoltaic cells with display devices. Photovoltaic cells may be arranged so as to capture light incident upon, reflected from, or generated by the display and convert it to electricity. Advantageously, in preferred embodiments, photovoltaic cells may be integrated with displays that depend primarily on ambient light, although other display technologies may also be used.
In some embodiments, as shown in
As illustrated in
The display element 101 may comprise features that permit ambient light 102 to transmit through the display element 101, such as holes, gaps or voids, as well as transparent physical structures. In addition, some active pixel areas may be transmissive or transflective. Hence, a PV cell 120 placed behind the display element 101 may capture some light 103 that, due to various structures in the display element 101, may transmit through the display element 101. Placement of a PV cell 120 behind the display may then beneficially be used to generate electricity.
Similarly, various kinds of display elements 101 may be integrated with a PV cell 110 formed in front of the display element 101. In such embodiments, some ambient light 102 may be captured by the PV cell 110 and used to generate electricity. Additionally, some of the light 104 reflected, emitted, or transmitted through the display element 101 toward a viewer is absorbed by the PV cell 110, leaving some light 105 to reach the viewer. This may reduce the contrast of the display element 101. However, the PV cell 110 formed in front of the display element 101 may be configured to be transmissive enough so as to reduce the adverse effect of the PV cell 110 on image quality. In addition to light 104 reflected or emitted from the display element 101, the PV cell 110 situated in front of the display element 101 will absorb and convert ambient light 102 to electricity, thereby generating an electric current. Therefore, although the PV cell 110 may reduce contrast of the display element 101, the tradeoff may be worth it in applications where the display element 101 may be expected to be in environments with considerable ambient light 102, such as a cell phone, or an outdoor display. Hence, in some embodiments, the PV cell 110 placed in front of the display element 101 is sufficiently transmissive both to allow some incident light 102 to reach the display so that sufficient light 106 strikes the display (especially in the case of a reflective or transflective display) as well as to allow sufficient light 104 transmitted, emitted, or reflected from the display element 101 to reach the viewer. In alternative embodiments, the PV cell may be patterned to be formed in front of areas in the display element 101 that are not used to generate an image (e.g., in between pixels in an image region of a display).
In embodiments with PV cell 120 disposed behind the display element 101, the PV cell 120 may capture ambient light 102 a, 102 b, 102 c that is transmitted through or past the display element 101 as illustrated by rays 103 a, 103 b, 103 c. Reflective or transflective displays do not always either absorb or reflect all incident ambient light back towards a viewer. Light may pass through a display element 101 (an the active image region or at the periphery) due to many different reasons. Placing a PV cell 120 behind the display element 101 may advantageously capture this unused light for the generation of electricity.
For example, ambient light 102 a incident near the periphery of a pixel or an active display region may simply pass through a gap 112 in the display, such as at the edges of an array or between pixels. Additionally, an interferometric display element 101 may comprise features such as holes, spaces or gaps in the opaque or translucent features through which light may pass. Often, such regions or areas are masked using a black mask to prevent such features from adversely affecting the viewed image. For example, gaps 112 within the active image region of the display element 101 may expose highly reflective structures underneath, such as a backplate 113, and may appear white and therefore wash out the image. Instead of masking these regions, a PV cell 120 may be placed behind the display element 101 so as to convert transmitted light 103 a to electricity, and such a PV cell 120 may simultaneously serve as a black mask by absorbing light that gets through the display element 101 and reverting reflections back to the viewer. Such a PV cell 120 may also be oriented so as to be in front of highly reflective surfaces in the rear of or behind the display. For example, a backplate 113 as shown can be highly reflective, but the highly reflective surface maybe any highly reflective surface situated behind the display element 101. The display element 101 may also comprise other features which contribute to transmission of ambient light through the display. For example, the display may comprise physical structures such as posts 18, support post plugs 42, rails, or pillars. These structures may be made of transparent materials, and may therefore transmit considerable light 103 c to a PV cell 120 situated behind the display element 101.
Additionally, active pixels 111 in a reflective or transflective display may transmit some light 103 b through to a PV cell 120 placed behind the display. For example, the MEMS reflector or mirror 14, while partially reflective, may transmit some light 103 b. This may be due to the thickness of the metal layer forming the mirror 14, or may be due to holes formed within the mirror 14. Without a PV cell 120 disposed behind the mirror 14 (opposite side of the mirror 14) from substrate 20, such light would be wasted.
The examples of light passing around or between pixels (as in light ray 103 a) and through support structures 18, 42 (as in light ray 103 c) demonstrate taking advantage of light passing through inactive regions within the image region or MEMS array. Materials can be chosen to maximize transmission through such inactive regions. Similarly, the shape, material, and/or thickness of the mirror 14 can be selected to maximize transmission through the active regions of the pixels (as in light ray 103 b) without sacrificing the moving mirror functions for the MEMs interference modulator.
As shown in
In embodiments where the pixel 111 a is primarily reflective, the reflected light 104, 105 will contribute to the image displayed by the display device 110. In embodiments where the pixel 111 a is not reflective, any reflected light 104, 105 may degrade the image and contribute to glare. In some embodiments, other layers may be formed over the PV cell 110, such as an antireflective coating or a passivation layer. Other layers serving various optical, electrical, or mechanical functions may also be formed over the PV cell 110.
As illustrated in
The transparent conductive layers 141, 142 may comprise any transparent, conducting material. Many transparent conducting materials are transparent conducting oxides (TCO). TCO layers are often used with photovoltaic materials, particularly thin film photovoltaic materials, in order to improve electrode contact to the PV material without blocking light. Functionally the TCO may electrically form a part of front or back electrodes, which typically comprise opaque metallic or conducting electrodes in electrical contact with the TCO material. In display applications, the opaque electrodes may be patterned to form large windows where the PV material can capture significant light. Alternatively, electrodes may make contact with the transparent conducting material outside of the image display region altogether. As known to those with skill in the art, a common TCO is indium tin oxide (ITO). Methods of forming or depositing ITO are well known in the art and include electron beam evaporation, physical vapor deposition, or sputter deposition techniques. Other TCO materials and processes of manufacture may also be used. The TCO layer can be omitted in other embodiments.
Generally speaking, PV cells 110 formed in front of a display 100 may comprise thin film photovoltaic materials, as described above. Some advantages of thin film PV cells are small device footprint and scalability of the manufacturing process. In applications where the PV cell 110 is disposed in front of the display 100, thin film PV cells may be designed to be partially transmissive. In embodiments where the PV cell is placed in front of the display, the transmittance is desirably high enough for the display image to remain good, yet high transmittance reduces the efficiency of the PV cell. To keep high image quality in the display while still obtaining desired power generation, the transmittance of the PV cell can be, e.g., greater than 65%. In one embodiment, the transmittance is desirably between 65% and 85%, and preferably between about 70% and 80%. Using the principles of interferometric design, it is possible to design an interferometrically enhanced PV stack or cell (see
The display element 101 of
As illustrated in
As explained previously, an interferometric modulator pixel may comprise an optical absorber (formed within the optical stack 16 of
In addition, the interferometric modulator pixel may be configured or designed to be partially transmissive and the active pixels may therefore be designed to be capable of allowing considerable ambient light to pass through and reach the PV cell 120 and its PV active material 81. In general, the reflector 14 may, for example, comprise a metal layer, such as aluminum (Al), molybdenum (Mo), zirconium (Zr), tungsten (W), iron (Fe), gold (Au), silver (Ag), and chromium (Cr) or an alloy of the foregoing, such as MoCr. The reflector 14 is typically thick enough to be opaque (e.g., 300 nm or more). However, in other embodiments, the reflector 14 is a partial reflector for a “transflective” IMOD display. The transmissivity of the reflector 14 in certain embodiments is dependent on the thickness of the reflector 14. Generally, a metallic reflector 14 that is a partial reflector will be between 20 and 300 Å, preferably less than 225 Å. By using thin semireflective layers in the reflectors 14 in various embodiments of a PV-integrated display 100, the interferometric modulator may be configured to allow from about 5% to about 50% to pass through the active array of display pixels to reach the photovoltaic material.
The various embodiments disclosed herein may be manufactured in different ways. For example, a display comprising an array of active pixels in an image region may be integrated with a PV cell by lamination of one of the PV cell and the display onto the other. Alternatively, for a PV cell disposed behind a display, the PV cell may formed, e.g., laminated or deposited, on a backplate that may be metallic or transparent, depending upon the application. The backplate may then be attached to the display to form the rear surface of the display device. In other embodiments where the PV cell is disposed in front of the display, the PV cell may be formed on a transparent coverplate, such as glass or plastic. The coverplate may then be attached or laminated onto the display, or the display may then be formed or deposited on one or the other side of the coverplate.
In other embodiments, the display and the PV cell may be formed on opposite sides of the same substrate using various deposition techniques known to those of skill in the art. For example, a glass substrate may be used as a substrate to form a display (e.g., substrate 20 in FIGS. 1 and 7A-7E) on one side of the substrate. The PV cell may also be formed on the other side of the substrate. For example, the PV cell may be deposited first on one side, and the display may then be deposited on the opposite side. As will be understood by one of skill in the art, the deposition of the PV cell and the display may be accomplished in various embodiments to allow the PV cell to be disposed in front of or behind the display.
While the foregoing detailed description discloses several embodiments of the invention, it should be understood that this disclosure is illustrative only and is not limiting of the invention. It should be appreciated that the specific configurations and operations disclosed can differ from those described above, and that the methods described herein can be used in contexts other than fabrication of semiconductor devices. The skilled artisan will appreciate that certain features described with respect to one embodiment may also be applicable to other embodiments. For example, various features of an interferometric stack have been discussed with respect to the front side of a photovoltaic cell, device or array, and such features are readily applicable to an interferometric stack formed over a back side of a photovoltaic cell, device or array. For example, various reflector features have been discussed with respect to various embodiments of interferometric modulators formed over a front side of a PV device. Such reflector features are also applicable to interferometric modulators formed over a back side of a PV device, including the use of partial reflectors, or the omission of a reflector while using the back electrodes as a reflector for some embodiments of an interferometric modulator.
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|U.S. Classification||359/290, 136/246|
|International Classification||H02N6/00, G02B26/00|
|Cooperative Classification||Y02E10/50, H01L31/043, Y10T29/49002, G02B26/0841, G02F2001/13324, G02F1/133512, G02F1/13306, G02B26/001|
|Nov 5, 2008||AS||Assignment|
Owner name: QUALCOMM MEMS TECHNOLOGIES, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOTHARI, MANISH;KHAZENI, KASRA;REEL/FRAME:021796/0652;SIGNING DATES FROM 20081030 TO 20081103
Owner name: QUALCOMM MEMS TECHNOLOGIES, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOTHARI, MANISH;KHAZENI, KASRA;SIGNING DATES FROM 20081030 TO 20081103;REEL/FRAME:021796/0652
|Aug 25, 2015||FPAY||Fee payment|
Year of fee payment: 4